<lv-group lvDirection="vertical" lvGutter="8px">
  <lv-group lvGutter="8px">
    <button lv-button (click)="expandAll()">Expand All</button>
    <button lv-button (click)="collapseAll()">Collapse All</button>
    <button lv-button (click)="expandNode()">Expand Specified Node</button>
    <button lv-button (click)="collapseNode()">Collapse Specified Node</button>
    <button lv-button (click)="toggleNode()">Switch Specified Node</button>
  </lv-group>

  <p>activeNode: {{ activeNode?.label || 'none' }}</p>

  <div class="tree-container">
    <lv-tree [lvData]="data" lvSelectionMode="multiple" lvShowCheckbox (lvCheck)="checkNode($event)"></lv-tree>
  </div>
</lv-group>
